Mer mfg



July 10, 1928. 1,676,388

c. T. EVANS MOTOR STARTER Filed Oct. 1924 2 Sheets-Sheet 1 8G "I l i l v, l I: I

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L1 l| 2 1: 0L 1 1:: III i 5 IJ 1 E .4 TTORNE V July 10, 1928. 1,676,388

c. T. EVANS MOTOR STARTER Filed Oct. 2, 1924 2 Sheets-Sheet 2 -//v VENTOR A TTORNE Y byrmovementof an operating handle front .position.

Patented July 10, 1928.

UNITED STATES CLARENCE T. EVANS, OF MILW'AUKEE. NISCONSIN. ASSIGNOR TO THE CUTLER-HAM- PATENT OFFICE.

LIER IllIFG. (.70., OF DIILW'AUKEE. WISCONSIN, A CORPORATION OF \VISCONSIN.

MOTOR STARTER.

Application filed October 2, 1924.

-This invention relates to motor starters. and is particularly applicable to compensator-starters for induction motors.

an operating handle from a normal extreme .position into an opposite extreme position and for establishment of running connections upon release of such operating handle. run ning connections being maintainet'l by a low voltage-magnet and being capable of interruption by movement of the starter from running position directly to oil' or normal Among the advantages of such a starter may be mentioned simplicity and case of operation and a natural dela v in the tram sition from starting connections to running connections.

The present lnventlon has tllllflllfj its ob- 'jects to provide an improved compensator starter hav1ng operating clniracteristics of the aforedescribed fuse. start-er, or in other words, :to provide a compensator starter whereinstarting connections are established a normal extreme position to an opposite extreme position, and running connections are established by release of such handle. the.

starter having a low voltage magnet associatedtherewith for maintaining the running connections and bein; adapted to rr turn directly to neutral position under low voltage conditions.

Another object of the invention is to p"; vide a compensator starter of the aforesaid character including two movable contact clcments each having an extreme neutral position. all desired commutntions of circuit. including opening thereof. being elicctctl h movement of the elements each from one c. l treme position to another cxtrcmc position and release thereof.

Another objectis to provide an exceedingly compact. simple and rugged cmupt'ltsator starter of the aforesaid character haw ing its parts arranged to facilitate ll'lSPtCllOll and repair thereof and to also facilitate wiring of the starter.

Various other objects and advantages of the invention will hereinafter appear.

The accompanying drawings illustrate an embodiment of the invention which will now be described, it being understood that thc Serial No. 741,104.

embodiment illustrated is susceptible of modification without departing from the scope of the appended claims.

In the drawing:

Figure l is a side elevational view of the compensator starter, the casing and oil receptacle therefor being shown in section.

Fig. 2 is a front elevational view of certain of the parts shown in Fig. 1, the cover for the starter being removed, and the oil receptacle being shown in section.

Fig. 3 is a fragmentary view illustrating the switch mechanism in starting and running positions, and I Fig. 4 is a diagrammatic view illustrating the circuit connections for the starter.

Referring to Figs. 1 and 2, the controller shown therein is particularly adapted to control a three phase alternating current motor, and includes movable contact elements 1 and 2, and a stationary contact element 3. As hereinafter set forth, contact elements 1 and 2 are normally in the extreme positions shown in Fig. 1 and are movable simultaneously to opposite extreme positions shown in full lines in Fig. 3, the contact element 1 being then adapted to cooperate with stationary contact element 3 to establish starting connections for the motor. Contact element 2 is adapted to be releasably held in the extreme position shown in Fig. 3 by a low voltage magnet. st. and in such posilion the same is adapted to cooperate with contact element- 1 upon return of the ltltlcl to normal position to establish running con net-lions. Upon release of contact element l the low voltage magnet 4, said element is adapted to return to the position shown in Fig. 1 to interrupt the running connections.

[;3'c specifically, contact elements 1 and 2 :21? pr-oridt-d with rotatable supporting shafts 5 and 6. respectively, said shafts be ng arranged in a parallel relation and being supported at opposite ends by bearings provided in brackets 7 and S fixed to an insulating panel 9. Contact element 3 includes a su n iorting rod 10 arranged in a parallel relation with respect to shafts 5 and (l and fixed at opposite ends to brackets T and S, Shaft 5 is provided with a square in ulated portion ll which carries five downwardly extending switch arms, 12 to ll inclusive. each of said switch arms bein; secured to the insulated portion of said shaft by a cap member 1?. Zach of the arms 12 to 16, inclusive, carries a pair of fingers 1818, Fig. 1, the lower ends of each of-said fingers being provided with a Contact tip 19. The fingers 18 of each arm are arranged in opposed relation and are pivotally secured intermediate thcirends to their respective switch arm by pins 20.

Also, the fingeis 18'of each-of the switch I arms of element 1 are biased to move in oplu' posite directions by a spring 21", such movement bc'inglimited by engagement of the upper ends of said fingers with stops 22 on their respective switch arms- Shaft 6 is provided with square insulated portion carry izig"three contact arms 23, 24 and 25 arranged as hereinafter described. Each of said'arms issecured shaft 6 by a cap member 26,*and is provided with a contact tip"27 on-the lower end thereof. Contact element' 3"iiicludes five contact supporting arm's 2810 32, inclusive, arranged ashereinafter described and each of said 'arms is secured to a square insulated portion of shaft 10 by a cap member 33 and is prowlded with a contact tip 34 on the lower end thereof.

The operating. means for contact elements 1 and 2 willnow'be more fnlly'described in "connection*with Figs. 1 and'2.

Asshown in these figures, shaft 5 of contact element 1 has an upwardly extending arm" 35 fixed thereto, the upper end of' said arm being provided .jwith' a slot 36' to receive a roller 37 carried by anarm 38'. Arm 38is fixed to a shaft 39 supported within hearings in a bracketgio mounted on panel 9 and said shaft' isbentupwardly as shown in Fig. 2,

and carries an operating handle 41 on the upper end thereof. Shaft also has a second upwardly extending arm 42 fixed thereto, the free end of said arm being operatively connected to contact element 2 through the medium of an arm -13 fixed to sha ft 6 and a link 44 pivotally connected to the free end of arm 42. Link 41 is operativcly connected to arm -13 through the medium of a lost motion connection ('(llll- )l'i.lllg an elongated slot 45 in said link and a pin 46 fixed to the free end of arm -13.

The arrangement is such that upon movement of handle 4-1 in a clockwise direction from the normal cxtrel'ne position illustrated in Fig. 1 to the extreme position illustrated in Fig. 3 contact element 1 is moved to the extreme position illustrated in full lines in Fig. 3 through the medium of levers 35 and 38, and during such movement of contact element 1 contact element 2 is also moved from the extreme position shown in F ig 1 to the position shown in Fig. 3 through the medium of arm 42. link 44 and arm 43. As before stated contact element 2 is adapted to be releasahly held in the position shown in Fig, 1, hr the low voltage magnet 4 and it is apparent when the same is held in such position the lost motion connection between link =14 and arm 43 permits return of contact element 1 to normal position. Also it is apparent that said lost motion connection permits return of contact element 2 to normal position after return of contact element 1 to its normal position.

The low voltage release magnet 4 is provided with a U-shaped frame 50 having an armature member 51' pivotally seclired thereto. Magnet'frame-filiis carried by a. bracket 52 fixed toaint 9 and arrnati'ir'e member 51 is provided with ahooked projection 56 to engage pin 46' on arm 1530f contact element 2 when thelatter isnloved to the position'shown' iii Fig. 3. In the arrangement shown contact element 13- isbia'sed to move to its normal position by a sSriiig-S? posite end fixed tofibra'cketB while contact element 2 is biasedtowardsflitsnetitral position by a weighted portion 58 onariir t3c' The circuit connections of the af dred'escribed compensator starter will ntiw be' more fully described in connection with Fig.

' 4. As shown in this figure,-tlie"stlartler is adapted to establish starting andfrunnifig connections for a"polypliase" motor M'fiom a. three phase circuit indicated by lines L, I and L. Lines L, If and I) are permanently connected to switch arms-12,14 and 15, respectively, of contact "eltdeiit"1",'- and the switch arms 12 and 16 are"peimanently connected to contact arms 23 and 25of con tact element 2. The terminals Mfand M of motor M are permanently connected to switch arms 13 and I5 of element 1,-while the intermediate terminal- M of the motor is permanently connected to switch arm 24 of element 2 and contact arm 30 of element 3. Contact arms 28 and 32 are connected to one terminal of compensator windings (L and C". respectively, and the opposite tern'ii'nals of said windings are both connected to terminal M of the motor. Also, the compensator windings C and C are provided with intermediate ta'ps connected to Contact arms 29 and ll. respectively, of stationary contact element 3.

The electrical connections made between the supply circuit and the motor when the contact element 1 of the starter is moved into engagement with the contacts of the stationary contact element 3 and out of engagement with said stationary contact element and into engagement with the contacts of element 2 are apparent to those skilled in the art, and it is sufiicient to state that in the starting position of the compensator, witidinc C is connected across phase L"lf while compensator winding C is connected across phase 11 -11 and reason of the connection of terminals M-'l\[ of the motor to the intermediate taps of the compensator windings the motor will receive less than the full potential of the supply line. In therunning position of the starter the terminals of the motor are directly connected to supply lines L, L and L through engagement of the contacts of element 1 with the contacts of element 2, and the motor will thus be supplied with full line potential.

As shown in Fig. 4 the low volt-age magnet 4 is connected between line L and terminal M of the motor through the-medium of a normally closed push botton P. B., and the armature 5l'will thus be attracted to hold contact element 2 in the position shown in Fig. 3 immediately upon establishment of running connections, circuit being established from line L through said push button and said magnetto the motor terminal M and thence to line L through contact arms 30 and 14 of the starter. As before stated,

contact element 2 is maintained in the exdrawing, as, for example, by auxiliary'contacts controlled by the starter mechanism, and it'is also apparent that the contact arrangement of the starter can be modified if desired. I

As before stated, the switch mechanism is supported on a panel 9 and as shownin Fig.

1 said panel is fixed to a casing 60 by suitable brackets 61. Casing 60 is provided with hinged cover 62 and said casing is of such dimensions as to permit mounting of the compensator windings C and C therewithin and above the switch mechanism. The coinpensator windings C and C can be of usual construction, the same being provided with the usual current taps, and having av core structure which is secured in a. suitable manner to the casing 60. It is also desirable to provide for oil immersion of the control contacts and for this purpose an oil receptacle 63 is provided which is adapted to be suspendedfrom the brackets 7 and 8 by releasable clamping devices 64 illustrated in Fig. 2.

In connection with the foregoing, it should be noted that the cover 62 and oil receptacle 63 can be readily removed for inspection or repair of the compensator, and it should be also noted that by designing 'the casin member 60 as shown in Fig. 1 a clear space is provided to the rear of panel 9 and to the rear of the compensator windings. Thus, the required connections can be brought in, through openings 65 in lower end of easing 60, or through openings 66 in the upper end thereof, and such taps can be connected to suitable terminals mounted on insulating panel 9.

WVhile th aforedescribed start-er has been shownas provided with manual operating means, the same can be readily operated elec tromagnetically if desired. To provide for electromagnetic operation of the compensator-it is merely necessary to employ a magnet 'for operating shaft 39, such magnet when energized-being adapted to rotate said shaft in clockwis direction, Fig, l, for establishment of starting connections, and when deenergized to permit reverse rotation of said shaft for establishment of running connections.

' What I-claim as new and desire to obtain by Letters Patent is:

l. A'compensator starter for induction motors, comprising coo crating contacts and operatingmeans there or including an actuating'part-having an extreme neutral position and being movable to another extreme position to effect establishment of startingconnections, and an electromagnet for restrainingcertain of said contacts against movement'whereby 'running connections are "established upon 'release of said actuating p'artsubject to interruption of such connec--' tions upon-failure-of voltage, said contacts "including-"contacts carried by movable ele =men'ts -eaeh bi'ased to an 'extreme position for interruption' of both starting and running connections- 2.-A compensator starter for induction motors, comprising cooperating contacts to establish starting connections and running connections and to-interrupt both said con- "nectionsincluding contacts carried by movable elements each biased toan extreme position to effect interruption of both starting and running conntctions, operating means for said elements whereby movement otboth elements to their opposite extreme positionsand release of said elements progressively etfects'progressive establishment of starting connections, interruption of starting connections and establishment of running connections and interruption of both starting and running connections, and a low voltage magnet for holding one of said elements in an extreme position to maintain running connections pending deenergization of said magnet.

3. A compensator starter for induction motors, comprising cooperating contacts, certain being movable and being engageable and disengageable with one another to establish and interrupt running connections and certain being stationary and being adapted to cooperate with certain of said movable contacts to establish starting connections.

4. A compensator starter for induction motors, comprising a movable contact element, contacts to cooperate with said element in one extreme position thereof to establish stauting connections and other contacts to cooperate with said element in an opposite extreme position thereof to establish'vunning connections, said latter contacts being movable to interrupt runnm connections =vvliile5 said element :is maintained in-- its lastnientioned extreme position.

rat-compensator starter-for induction motors, comprising-1a movablecontact element,-contactis-to'-bezengaged. by said element. uporrr'nouement thereof into one extreme position-to "establish starting connections,-contacts-. to beengagedby said element u-ponmdvementthereofinto. an opposite extreme position to establish running connections and meansz associatedwith said last mentioned contacts to.- move the same out of engagementwitlr said contact element for interruption. of said running connections.

= "6. In areompensator starter for induction motors, in combination as plurality of stationary contacts, and a plurality of movable contacts each movable from a normal extreme position into an opposite extreme positioncertain of; said movable contacts being adapted in thei-r opposite extreme position to engage said stationary contacts for estabblishment of starting; connectionsand cer-, tainnotherof= said.movable contacts being adapted-in their normal positions to cooperateavith certain-other ofsaid movable contacts in their .opposite extreme positions to establish running connections.

'l'H-A compensator, starter for induction motors, comprising a plurality of stationary contactsand a plurality of movable contacts each biased toward a normal extreme position and movable into an opposite extreme.

position, certain of said movable contacts being adapted-in their opposite extreme position to engagesaid stationary contacts for establishment of starting connections and.

. sa-id stationary contacts to estab adapted. in its latter extreme nosition to establish starting connections and. also beiiw D adapted in its normal position to cooperate on with the other of sa d elements. in its opposite extreme positionto establish; running, QOllHBCi-l0nS,' lll(lelectromagnetic means for ltr tlztllllllg sa d last mentioned,elenientin its oppositctnatremeposition,subject'toanto- 5 inati: release under predetermined. condit ons. -,...g.

.9. -;l=n a motor controller, ,in combination, 7 two contact elements each -norm al l y .tending to stand in a given extreme position and be ng movable to an opposite estremq-Ipqigition, one ofsaid elementsinits opposite cab, treme gbosituon being adapted ,to, starting connections, and they other being adapted in its oppo site extrenie po sitiorifto 7 cooperate with the formerg-eleme ntfiri the normalposition thereofito establish en a c mon sp rtanealer fe s el n pr id .fg -sim lthh il trome pqsition,s,,and.permr v iii-st nt ntioned iele meritltol its: norm'il. posiion in ep y -I e btli fs it. n electromagnetic means 015: restraining f'sa'id latter element in. its} oppositeieirtreinje, position subje-t to automatic release .gndgipredetermined-conditions..,..

tionary contacts, one set of saidi'imov'fable contacts being adapted to c'oolei-ate iui th i h seein connections and being? also' adaptedl ofcooperate withsthe other set of said fniovable n t t establish ng. .Qdnadction operating means for said movable contacts including a member having an eat'reme'position-corresponding to. starting relation of said contacts and another'e. \'treme position corresponding torunning: relation of said 10) contacts, said means insuring cooperation of said contacts in start-ing relation prior to their cooperation in running relation, and said contacts being returnable directly from running relation to neutral relation While said member is maintained in its last mentioned position, and electromagnetic 'means for holding certain of said contacts in a given extren'ie position upon establishment of running connections.

In witness whereof. have hereunto subscribed 111 name CLARENCE T. EVANS.

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